I mean.. a live concert should be.. "live" where you can see your favorite star perform.

Music is emotion, feeling. I mean facial expression during a song is really important.

But a hologram? lol.. I dunno if i can accept that yet

Bah. What, because Miku is a voice synth program, she's not alive? As far as I can tell, during the 39's Giving Day concerts, she was live - I saw her, and Rin, and Len, and Luka all perform live on a stage in front of hundreds of fans. And there was emotion there - both in the crowd and amongst the performers. Hell, Miku cried during her second concert.

Also there are plenty of other concerts featuring music from anime performed by live human beings (typically the voice actresses of characters). For example, a live performance of "Sousei no Aquarion":

Alice (full name, Western style: Alice Margatroid) is from several Touhou Project games; most notably she first appeared in Touhou Project 5: Mystic Square for the PC-98. He first appearance in a Windows-based game was Touhou Project 7: Perfect Cherry Blossom. She's a magician and puppeteer. Shanghai Shanghai Shanghai Hourai Hourai Hourai~

Youmu (full name, Japanese style: Konpaku Youmu) is also from several Touhou Project games; her first appearance was in Touhou Project 7: Perfect Cherry Blossom; she's slated to appear as a protagonist in the thirteenth (at least, numbering-wise) TH game, "東方Project第13弾 東方神霊廟（とうほうしんれいびょう） ～ Ten Desires." Youmu is Saigyouji Yuyuko's assistant and gardener; she's half-human, half-ghost, and half-baked, if her boss subtitle is to be believed.

Basically, they're all characters from the Touhou game series; you can learn more at http://touhou.wikia.com/. I won't elaborate further, because there are a lot of Touhou games, the fandom is huge (huge enough that there are over a thousand fan albums of just the game's music; not to mention even more fan comics, figures, plushies... there are even fan games of Touhou games! And there are fan comics of fan comics. Basically, Touhou is, in and of itself, an entire indie industry), and the games are difficult. (FYI: they're bullet hells. I love 'em to death, but I'm terrible at them.)

IMO the coolest thing about Touhou is that all of the main bullet hell games are done by a single guy, ZUN - all of the programming, art (lol, ZUNart), bullet patterns, mechanics, music... he does produce the games under the "team" name of Team Shanghai Alice.

-- Griffinhart

ETA: Also, the Rule ⑨ I keep referring to: "If it exists, there is a Touhou crossover with it." Yes, Touhou is that prolific. (Also, the ⑨ stems from a meme in one of the games' manuals, where a character - Cirno, an ice fairy who, in fanon, has the propensity for claiming herself to be "the strongest" - was labeled "⑨ - Baka". Henceforth, the circled nine has been a reference to Cirno in specific and Touhou in general.)

ETA2: As for my image sources: I keep sayin', Danbooru. But if you want a specific link, you can always stick the image/the image URL into http://iqdb.org/ and reverse-image search for the sauce.